Wow, that looks like a great cannabis! Could you please tell me, I think you're an experienced person in growing this, so, what does it mean if the bottom leaves of the plant are turning yellow? And what to do if the plant doesn't grow as fast as it should grow?
could be many things...
not always a bad sign...
got pictures?
Yes

Here:
That's nothing to worry about.
Some leaves are missing or damaged. Looks like bugs.
Cannabis does not do well in forrests. It usually gets eaten.
Yes, I know, now using a special sprayer from bugs, but what about the yellow leaves, what to do with that?
Could be a million different things - don't worry.
And: Don't use bugspray.
Well, ok then. Thank you for your help